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Fig. A.1.
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Expanding HII region in a pure hydrogen medium for 643 (red), 1283 (green), and 2563 (blue) gas particles. The three panels show the ion fractions at t = 100 Myr (left), t = 1500 Myr (middle) and the temperature after 100 and 1500 Myr (dashed and solid line, respectively).
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